The Wacker Neuson 5200021644 Seat is a genuine OEM component designed for the APT4S and APT4T series self-priming pumps, including Cold Weather, Surge Brake, and Electric Brake configurations. As a direct OEM replacement, it is manufactured to the same specifications as the original part, ensuring a correct, consistent fit across the supported pump lineup. This seat is compatible with both skid-mounted APT4S units and the full range of APT4T variants, making it a versatile service part for mixed fleets. When the original seat becomes worn or damaged, replacing it with part number 5200021644 restores proper valve function and maintains pump efficiency.
Key Features
- Genuine OEM Material Integrity — Manufactured to Wacker Neuson's original material and dimensional specifications, ensuring the sealing surface performs correctly under operating pressure and flow conditions.
- Drop-In Replacement — Engineered to install directly in place of the original seat with no reworking of the valve body or surrounding components.
- Broad APT Series Compatibility — Fits APT4S Pump with Skid, APT4T Pump with Surge Brake, and APT4T Pump with Electric Brake, including Cold Weather variants of each configuration.
- Valve Performance Restored — A correctly seated valve prevents backflow and pressure loss; a worn or pitted seat causes loss of prime, reduced discharge volume, and increased wear on downstream components.
- Verified Part Number — Sourced directly under Wacker Neuson part number 5200021644, eliminating guesswork when ordering for multiple APT4S and APT4T machine configurations.
A seat is a precision sealing surface within the pump's valve assembly that controls the directional flow of fluid through the pump body. It mates against a corresponding valve disc or ball to create a tight seal that prevents fluid from flowing backward when the pump is priming or operating under load. When the seat becomes worn, corroded, or cracked, the valve can no longer seal fully, resulting in loss of prime, reduced flow rates, and increased strain on the pump as a whole. Replacing a damaged seat promptly with a properly specified part restores correct valve action and protects the broader pump assembly from accelerated wear.
Part Details
| Part Number | 5200021644 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Seat |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
| APT4T Pump, Surge Brake, Cold Weather | APT4T CW | 5200019792, 5200019793 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
